Achieving tolerant CO2 electro-reduction catalyst in real water matrix

[Display omitted] •Electro-reduction of CO2 was performed in real water matrix (tap water) conditions.•Iron was found to be the most detrimental element in silver catalyzed CO2 electro-reduction.•Nitrogen doped carbon based material was designed to be a stable model catalyst in real water.•Stable pe...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2019-12, Vol.258, p.117961, Article 117961
Main Authors: Won, Da Hye, Shin, Hyeyoung, Chung, Min Wook, Jung, Hyejin, Chae, Keun Hwa, Oh, Hyung-Suk, Hwang, Yun Jeong, Min, Byoung Koun
Format: Article
Language:English
Subjects:
Ball milling
Carbon dioxide
Carbon monoxide
Carbon nanotubes
Catalysts
Deactivation
Drinking water
Durability
Electrocatalyst
Electrochemistry
Iron
Nitrogen
Stability
Tap water
Zinc
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Summary:[Display omitted] •Electro-reduction of CO2 was performed in real water matrix (tap water) conditions.•Iron was found to be the most detrimental element in silver catalyzed CO2 electro-reduction.•Nitrogen doped carbon based material was designed to be a stable model catalyst in real water.•Stable performance was tested for an unprecedented long-time of 120 h in tap water media. In order to achieve practical application of electrochemical CO2 conversion technologies, the development of durable catalyst in real water matrix is essential because the use of catalysts only showing high performance within a well-refined environment cannot guarantee their feasibility in realistic conditions. Here, we report a design strategy for a catalyst, which shows excellent tolerance to deactivation factors, using a carbon-based material under more practical condition implemented by real tap water. Screening analyses on various components in tap water elucidated that the impurity group, which can be deposited on the catalyst surface and impede the active sites, such as copper, zinc, and especially iron are the main factors responsible for deactivation. Based on these findings, the structural modified nitrogen-doped carbon nanotube (denoted as ball mill N-CNT) was adopted as a catalyst design to secure durability. Consequently, the ball mill N-CNT revealed tolerance to the disclosed deactivation factors and showed stable performance during unprecedented long-time of 120 h in tap water media.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2019.117961